Maintenance: Remove doc as database name across the board

The default CrateDB database is called `crate`.
`doc` is certainly wrong (default schema name), so let's remove it.

If we would use `crate` instead, it would add more `crate` noise,
and also suggest that the reader may use a different database name
instead, which currently is not possible.

So, the only viable conclusion is to remove it,
unless there are different proposals.

Author: amotl

docs/connect/general.md

@@ -59,17 +59,17 @@ applications and drivers may obtain connection properties in different formats.
 
 **Native PostgreSQL, psql**
 ```text
-postgresql://<user>:<password>@<cluster>.cratedb.net:5432/doc
+postgresql://<user>:<password>@<cluster>.cratedb.net:5432/
 ```
 
 **JDBC: PostgreSQL pgJDBC**
 ```text
-jdbc:postgresql://<cluster>.cratedb.net:5432/doc?user=<user>&password=<password>
+jdbc:postgresql://<cluster>.cratedb.net:5432/?user=<user>&password=<password>
 ```
 
 **JDBC: CrateDB JDBC, e.g. Apache Flink**
 ```text
-jdbc:crate://<cluster>.cratedb.net:5432/doc?user=<user>&password=<password>
+jdbc:crate://<cluster>.cratedb.net:5432/?user=<user>&password=<password>
 ```
 
 **HTTP: Admin UI, CLI, CrateDB drivers**
@@ -119,17 +119,17 @@ crate://<user>:<password>@<cluster>.cratedb.net:4200/?schema=doc&ssl=true
 
 **Native PostgreSQL, psql**
 ```
-postgresql://crate@localhost:5432/doc
+postgresql://crate@localhost:5432/
 ```
 
 **JDBC: PostgreSQL pgJDBC**
 ```text
-jdbc:postgresql://localhost:5432/doc?user=crate
+jdbc:postgresql://localhost:5432/?user=crate
 ```
 
 **JDBC: CrateDB JDBC, e.g. Apache Flink**
 ```text
-jdbc:crate://localhost:5432/doc?user=<user>&password=<password>
+jdbc:crate://localhost:5432/?user=<user>&password=<password>
 ```
 
 **HTTP: Admin UI, CLI, CrateDB drivers**

docs/connect/go/ksql.md

@@ -49,7 +49,7 @@ func main() {
     ctx := context.Background()
 
     // Connect to database.
-    dbURL := "postgresql://crate:crate@localhost:5432/doc?sslmode=disable"
+    dbURL := "postgresql://crate:crate@localhost:5432/?sslmode=disable"
     db, err := kpgx.New(ctx, dbURL, ksql.Config{})
     if err != nil {
         log.Fatalf("unable connect to database: %s", err)
@@ -81,7 +81,7 @@ For connecting to CrateDB Cloud, use `sslmode=require`, and
 replace username, password, and hostname with values matching
 your environment.
 ```go
-dbURL := "postgresql://admin:[email protected]:5432/doc?sslmode=require"
+dbURL := "postgresql://admin:[email protected]:5432/?sslmode=require"
 ```
 
 :::{rubric} Quickstart example

docs/connect/go/pgx.md

@@ -44,7 +44,7 @@ func main() {
     ctx := context.Background()
 
     // Connect to database.
-    conn, _ := pgx.Connect(ctx, "postgresql://crate:crate@localhost:5432/doc?sslmode=disable")
+    conn, _ := pgx.Connect(ctx, "postgresql://crate:crate@localhost:5432/?sslmode=disable")
     defer conn.Close(ctx)
 
     // Invoke basic query.
@@ -68,7 +68,7 @@ For connecting to CrateDB Cloud, use `sslmode=require`, and
 replace username, password, and hostname with values matching
 your environment.
 ```go
-conn, _ := pgx.Connect(ctx, "postgresql://admin:[email protected]:5432/doc?sslmode=require")
+conn, _ := pgx.Connect(ctx, "postgresql://admin:[email protected]:5432/?sslmode=require")
 ```
 
 :::{rubric} Quickstart example

docs/connect/go/pq.md

@@ -23,7 +23,7 @@ import (
 func main() {
 
     // Connect to database.
-    connStr := "postgresql://crate:crate@localhost:5432/doc?sslmode=disable"
+    connStr := "postgresql://crate:crate@localhost:5432/?sslmode=disable"
     db, _ := sql.Open("postgres", connStr)
     defer db.Close()
 
@@ -48,7 +48,7 @@ For connecting to CrateDB Cloud, use `sslmode=require`, and
 replace username, password, and hostname with values matching
 your environment.
 ```go
-connStr := "postgresql://admin:[email protected]:5432/doc?sslmode=require"
+connStr := "postgresql://admin:[email protected]:5432/?sslmode=require"
 ```
 
 :::{rubric} Quickstart example

docs/connect/java/cratedb-jdbc.md

@@ -42,7 +42,7 @@ void main() throws SQLException {
     properties.put("user", "crate");
     properties.put("password", "crate");
     Connection conn = DriverManager.getConnection(
-        "jdbc:crate://localhost:5432/doc?sslmode=disable",
+        "jdbc:crate://localhost:5432/?sslmode=disable",
         properties
     );
     conn.setAutoCommit(true);
@@ -71,7 +71,7 @@ your environment.
 properties.put("user", "admin");
 properties.put("password", "password");
 Connection conn = DriverManager.getConnection(
-    "jdbc:crate://testcluster.cratedb.net:5432/doc?sslmode=require",
+    "jdbc:crate://testcluster.cratedb.net:5432/?sslmode=require",
     properties
 );
 ```

docs/connect/java/postgresql-jdbc.md

@@ -42,7 +42,7 @@ void main() throws SQLException {
     properties.put("user", "crate");
     properties.put("password", "crate");
     Connection conn = DriverManager.getConnection(
-        "jdbc:postgresql://localhost:5432/doc?sslmode=disable",
+        "jdbc:postgresql://localhost:5432/?sslmode=disable",
         properties
     );
     conn.setAutoCommit(true);
@@ -71,7 +71,7 @@ your environment.
 properties.put("user", "admin");
 properties.put("password", "password");
 Connection conn = DriverManager.getConnection(
-    "jdbc:postgresql://testcluster.cratedb.net:5432/doc?sslmode=require",
+    "jdbc:postgresql://testcluster.cratedb.net:5432/?sslmode=require",
     properties
 );
 ```

docs/connect/python.md

@@ -129,7 +129,7 @@ more modern PostgreSQL and Python features, such as:
 ```python
 import psycopg
 
-with psycopg.connect("postgres://crate@localhost:5432/doc") as conn:
+with psycopg.connect("postgres://crate:crate@localhost:5432/") as conn:
     with conn.cursor() as cursor:
         cursor.execute("SELECT * FROM sys.summits")
         for record in cursor:

docs/connect/scala/index.md

@@ -44,7 +44,7 @@ object Example {
 
     // Configure connection.
     val driver = "org.postgresql.Driver"
-    val url = "jdbc:postgresql://localhost:5432/doc?sslmode=disable"
+    val url = "jdbc:postgresql://localhost:5432/?sslmode=disable"
     val username = "crate"
     val password = "crate"
 
@@ -81,7 +81,7 @@ your environment.
 
 Also use this variant to connect to CrateDB Cloud.
 ```scala
-val url = "jdbc:postgresql://testcluster.cratedb.net:5432/doc?sslmode=require"
+val url = "jdbc:postgresql://testcluster.cratedb.net:5432/?sslmode=require"
 val username = "admin"
 val password = "password"
 ```

docs/integrate/airflow/getting-started.md

@@ -139,7 +139,7 @@ file. To learn about alternative ways, please check the
 [Astronomer Environment variables documentation].
 The first variable to define is one for the CrateDB connection, as follows:
 
-`AIRFLOW_CONN_CRATEDB_CONNECTION=postgresql://<user>:<password>@<host>/doc?sslmode=disable`
+`AIRFLOW_CONN_CRATEDB_CONNECTION=postgresql://<user>:<password>@<host>/?sslmode=disable`
 
 For TLS, set `sslmode=require`. To confirm that the variable is applied, start
 the project and open a bash session in the scheduler container:

docs/integrate/airflow/import-stock-market-data.md

@@ -78,7 +78,7 @@ There are now three things you have to adjust before running Airflow:
 * Add your CrateDB credentials to the `.env` file. Open the file in a text editor, and add the following line, which takes the default credentials for CrateDB, with user = crate, and password = null. (note: my internal port for running CrateDB in Docker is 5433, which I use here. If using the standard Docker command with 5432, here it should also be 5432).
   ```bash
   # For local development only; do not commit real credentials
-  AIRFLOW_CONN_CRATEDB_CONNECTION=postgresql://crate:null@host.docker.internal:5433/doc?sslmode=disable
+  AIRFLOW_CONN_CRATEDB_CONNECTION=postgresql://crate:crate@host.docker.internal:5433/?sslmode=disable
   ```
 * If the default ports are unavailable, you can change them to free ports. Just open the `.astro/config.yaml` file in a text editor and update the web server port to 8081 (instead of default 8080) and Postgres port to 5435 (instead of the default 5432), like so:
   ```yaml